07-21-2014, 08:57 AM
If the airbag has a significant leak, you will be able to hear the air rushing out. In my case the system would maintain pressure, and as long as I was not moving, actually build pressure slowly (a couple of pounds a minute) but as soon as I started moving and the suspension started letting air out with the coach vertical movement, the pressure would start dropping.
To Richard's comment that Bill could not get the left rear to come up in manual mode, that COULD be a clue to a different issue. IF the coach will maintain pressure and if there is no sound of an air leak, then I would start looking at the air system as the culprit. If there is an airbag issue, you should be able to hear air rushing out of the airbag with the engine running. If you don't hear air rushing out, or it is not coming from the front corner that will not come up, you more likely have an air system issue.
Tom, you are correct, if manually trying to lift the corner that is low with a defective airbag WOULD result in you losing supply pressure quickly and would result in that corner continuing to drop. I keep forgetting that Bill's coach has the manual HWH system so it allows you to raise or lower a corner at a time. The automatic HWH systems only allow raising or lowering 2 corners at a time (front or rear, left side or right side). As I recall, the leveling and ride height valves are supposed to be isolated from each other. Richard is the air suspension guru on that system.
To Richard's comment that Bill could not get the left rear to come up in manual mode, that COULD be a clue to a different issue. IF the coach will maintain pressure and if there is no sound of an air leak, then I would start looking at the air system as the culprit. If there is an airbag issue, you should be able to hear air rushing out of the airbag with the engine running. If you don't hear air rushing out, or it is not coming from the front corner that will not come up, you more likely have an air system issue.
Tom, you are correct, if manually trying to lift the corner that is low with a defective airbag WOULD result in you losing supply pressure quickly and would result in that corner continuing to drop. I keep forgetting that Bill's coach has the manual HWH system so it allows you to raise or lower a corner at a time. The automatic HWH systems only allow raising or lowering 2 corners at a time (front or rear, left side or right side). As I recall, the leveling and ride height valves are supposed to be isolated from each other. Richard is the air suspension guru on that system.